78815001 has 8 divisors (see below), whose sum is σ = 107530720. Its totient is φ = 51321312.

The previous prime is 78814993. The next prime is 78815003. The reversal of 78815001 is 10051887.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78815001 - 2³ = 78814993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78815001.

It is not an unprimeable number, because it can be changed into a prime (78815003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305356 + ... + 305613.

It is an arithmetic number, because the mean of its divisors is an integer number (13441340).

Almost surely, 2^78815001 is an apocalyptic number.

It is an amenable number.

78815001 is a deficient number, since it is larger than the sum of its proper divisors (28715719).

78815001 is a wasteful number, since it uses less digits than its factorization.

78815001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611015.

The product of its (nonzero) digits is 2240, while the sum is 30.

The square root of 78815001 is about 8877.7813106654. The cubic root of 78815001 is about 428.7488437043.

Adding to 78815001 its reverse (10051887), we get a palindrome (88866888).

The spelling of 78815001 in words is "seventy-eight million, eight hundred fifteen thousand, one".